Ok, I misunderstood the last part of your comment.
If you ask me, I think the main reason why Spider-Man begins to sound a little younger than in Straczynski era after Mephisto thing, it's more related to Slott writting than any Marvel politic to make hin younger
I think the problem with most of the big names and the two big companies is character fatigue. There probably isn't a single story about the Hulk that hasn't already been done during the thousands of stories he's been in. It's the problem with having storytelling dictated by chasing profit...having characters that go on and on and on and on and never have a final chapter means that real storytelling suffers. If it only has a begining and then a middle and then another beginning and then another middle and on and on and on for decades...well that's not a story...that's wrestling.
You could name it "wrestling", or you could name it "life"
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